.5 A01 High Magnesium Aluminum Alloy Corrosion, Yield Behavior And Hot Deformation Behavior

In this paper, the corrosion resistance, yielding behavior and the behavior during hot compression deformation of 5A01 aluminum alloy have been studied by means of the slow strain-rate test, isothermal compression simulation test, electro-chemistry characteristic, metallographic microscope,SEM, TEM. Meanwhile,βphase in bulk form were prepared for the measurement of corrosion potentials by conventional electrochemical equipment. Experiments were also conducted to understand the nature of theβphase-a(Al) matrix galvanic couples in NaCl solution and dissolution phenomena associated with Mg-containing phase particle during the corrosion. The following conclusions can be drawn:(1) The optimum application values ofσb,σ0.2 andδare 421MPa,342MPa,7.8% for 5A01 alloy after cold-rolled 40%. tensile strength and yield strength of the prepared alloy increases, while the elongation decreases with increasing the reduction.For the 5A01 alloy after cold-rolled 60%,partial recovery and recrystallization orderly occur with the increase of annealing temperature during stabilizing treatment. The corrosion resistance of alloy under cold-rolled conditions all are worse. With increasing the reduction from 40% to 80%, the corrosion susceptibility of the alloy is increasing. For the 5A01 alloy after cold-rolled 60%, with the increasing of annealing temperature from 150℃to 350℃, the corrosion susceptibility of the alloy is decreasing.(2)In the solution of 3.5%NaCl,the corrosion potential of (3 phase(-1.085v) is lower than the corrosion potential of a(Al) phase(-0.812v). The (3 phase may be passivated in solution and occor the pitting,while the a(Al) phase could not occor.(3) After recrystallization is completed, the smaller the recrystallized grain the longer the Luders elongation.The frequency of serrations also increases with decreasing grain size.The frequency of serrations decreases and the magnitude of serrations first increases and then decrease with increase in strain. The cold-rolled sample which has higher dislocation density has more intense serration than the sample after recovery heat treatment.(4) To the 5A01 alloy after homogenization annealing:The stress increase with the strain rate at the same compression temperature, which show 5A01 aluminum alloy is positive strain rate sensitivity material, the stress increase with the compression temperature at the same strain rate. Deforming degree has little effect on the stress at the strain rate and the same compression temperature.The flow stress of 5A01 aluminum alloy during hot deformation can be expressed by Arrhenius function in the hyperbolic sine style. The values of A,α,n and Q in the analytical expression are 0.06831s-1,0.0094MPa,2.7089 and 161.14KJ/mol.